Bar-support for pantograph engraving-machines.



UNITED STATES PATENT OFFICE.

JOHN HOPE AND JOHN HOPE, JR, OF PROVIDENCE, RHODE ISLAND, AS- SIGNORS TOTHE JOHN HOPE & SONS ENGRAVING AND MANUFAC- TURING COMPANY, OF SAMEPLACE.

BAR-SUPPORT FOR PANTOGRAPH ENGRAVING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 665,098, dated January1, 1901.

Application filed August 21, 1899. serial No. 727,877. (No model.)

To aZZ whom it may concern.-

Be it known that we, JOHN HOPE and JOHN HOPE, Jr., of Providence, in thecounty of Providence and State of Rhode Island, have invented a new anduseful Improvement in Bar-Supports for Pantograph Engraving-Machines;and we hereby declare that the following is a full,clear,' and exactdescription of the same, reference being had to the accompanyingdrawings, forming part of this specification.

In pantograph engravingmachines the movement of the stylus in tracingthe pattern is transmitted to the gravers and to the roll by means ofbars engaging with levers or carriages connected with the gravers or thework. It is i mportant that these connections are flexible, so as toreadily move with the movement of the stylus and with the least possibleresistance, and these connections must be so positive that the slightestmovement of the stylus will be transmitted.

The invention consists in the peculiar and novel construction by whichthe bar or lever is supported on the beveled edges of two disksjournaled on antifriction-bearings in a block, as will be more fully setforth hereinafter.

Figure 1 is a front view of the support. Fig. 2 is a side view of thesame. Fig. 3 is a plan view of the supporting-block, the beveled disksbeing shown in broken lines. Fig. 4 is a sectional view of thesupporting-block, showing the ball-bearings of the spindle supportingthe block. Fig. 5 is a sectional view of the block, showing the bearingof the spindle of one of the beveled disks.

In the drawings, 0. indicates the part of a pantograph engraving-machinefrom which motion is transmitted to another part of the machine, usuallyan arm on which the block is pivotally supported; a, the spindle, se-

cured to the arm a, preferably by a clampscrew, as is shown in Figs. 1and 2, forming the pivotal support of the'block; b, the supporting-block; b, the bearingsfor the spindle a, and b the bearings forthe spindles c of the beveled disks 0 c. The spindles a and c areprovided with the annular grooves 0, a? .and c c for the balls.

The bearings 12' and b are made up of the races b b adj ustably held inthe required position above and below each which enters holes in theperipheral surface of the lock-nuts b. The bar 01 may be the barconnected with the stylus-carriage or any other bar of the pantographengraving-machine by which or through which motion is transmitted. Thebar (1 bears on the adjacent inclined edges of the beveled disks 0 c andmay be moved longitudinally, thereby causing the beveled disks torotate, or the bar (1 may be moved laterally to move the arm alaterally, or when the bar d and the arm a are pivotally supported thearm a may impart a swinging movement to the bar (1, or vice versa. Bythis construction the bar d is firmly supported on the adjacent bevelededges of the disks 0 o and may be moved longitudinally practicallywithout any frictional resistance, while the disks freely adjustthemselves to the bar automatically by the swinging of the block b.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. In a bar-support for pantographengraving-machines, in combination, a block supported on a spindle, twodisks having beveled edges, a spindle secured to each of the two disksextending downwardly therefrom and pivotallysupported in the block;whereby a bar may be supported on the beveled edges of the disks, asdescribed.

' 2. In a bar-support for pantograph engraving-machines, the combinationwith a member of the machine, and a spindle carried by the member, of ablock pivotally supported on the spindle by ball-bearings, two diskshaving beveled edges, spindles on the disks journaled on ball-bearingsin the block, and means for adjusting the ball-bearings; whereby motionmay be transmitted from one part of the machine to another part in onedirection while part of the machine is free to mov with or on thebeveled disks.

3. In a bar-support for pantograph engraving-machines, the combinationwith the spindle a secured to one part of the machine, the the supportmay automatically adjust itself, block b, the beveled disks 0 c and thespinas described.

dles c o, of annular grooves on the spindles In Witness whereof We havehereunto set for the balls 19 b the races b b above an]? our hands.

5 below each series of balls, the lock-nuts b in screw-thread engagementwith the inter- JR nally-screw-threaded holes a a the holes in theperipheral surfaces of the lock-nuts, and Witnesses: the out-awayportions 1) b"; whereby the ball- J. A. MILLER, J12,

1o bearings for the spindles may be adjusted and B. M. SIMMs.

